Primary Phase Morphology of Cooling Slope-Processed A356 Al Alloy and Its Effect on Rheological Properties

Das, P (2022) Primary Phase Morphology of Cooling Slope-Processed A356 Al Alloy and Its Effect on Rheological Properties. In: International Journal of Metalcasting .

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Abstract

A comprehensive study is performed to establish the correlation between microstructural features of the cooling slope-generated slurry (semisolid) of A356 alloy and its non-Newtonian flow behavior, in view of optimizing process variables of rheo-pressure die casting process technology. Differences observed in primary particle’s (α-Al) morphology, i.e., shape, size, and distribution, are originating from cooling slope processing of the alloy with different slope angle and melt treatment (via grain refiner addition) conditions. Isothermal, shear jump, and shear time tests are performed on cooling slope-generated slurry (at 590 °C and at a solid fraction of approx. 0.41) to estimate its rheological properties. Three different shear regimes—low, intermediate, and high shear—are identified from the viscous flow behavior of the slurry at isothermal conditions. Subsequently, a power law model is developed to mathematically express the dependence of slurry viscosity on microstructural features.

Item Type:	Journal Article
Publication:	International Journal of Metalcasting
Publisher:	Springer Science and Business Media Deutschland GmbH
Additional Information:	The copyright for this article belongs to Springer Science and Business Media Deutschland GmbH.
Keywords:	Aluminum alloys; Cooling; Isotherms; Non Newtonian flow; Rheology; Shear flow; Shear thinning, A356 Al alloy; A356 alloys; Cooling slopes; Flow behaviours; Microstructural features; Non-Newtonian flow; Phase morphology; Primary phase; Process Variables; Rheological property, Morphology
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	31 Jan 2023 06:40
Last Modified:	31 Jan 2023 06:40
URI:	https://eprints.iisc.ac.in/id/eprint/79599

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